Brake-shoe.



Patented Oct. 28, 1913.

A. L. STREETER.

BRAKE SHOE.

APPLICATION FILED DEU. 19, 1912. 1,076,922.

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ALFRED L. STREETER, OF CHICAGO, ILLINIS.

BRAKE-SHOE.

Specification of Letters Patent.

.Patented Oct. 28, 1913.

Application filed December 19, i912, Serial No. 737,853,

VBe it known that I, ALFRED L. S'rlmwriin, a citizen oit the United i'ltatesyand aresident ot Chicago, in the county oit Cook and State ot Illinois7 have invented a certain new and iiset'iil improvement in `Brake thoes, oit which 'the tolle-wing is a sjiiecitication.

This .invention relates to brake shoes and relates particularly to brake shoes of the type comprisingl hack sections ot a suitable, strong, tough metal, as malleable iron, provided with usual attaching and guide lugs tor securing1 said hack seotioiis into the brake heads, and separate wearingl sections adapted to he detaehahlv connected to-said hack see- 'tions, whereby, as said wearing; sect-ions are worn ont, they may he removed and replaced h v new nearing sections.

it primary object ot inv invention is to provide improved means tor securingy the wearing sections ot the shoes to the hack sections thereof, nf'hereh'vY said wearing portions may he conveniently and quickly detached and replaeech which will he simple, strong` and durable, and which will operate to connect said wearing' sections securely to lSiid hack sections.

ft further object ot my invention is to provide a hrale shoe of new and novel construction, the wearing' surface oit which coin.- prises relativelf7 hard and sott portions, the sott, portions ot said wearing section pio riding); Ythe desired traction or frietional en- Kojagement between the brake shoes and the ear wheels, and the hard sections thereot pre venting' excessive wear and lgreatly increasin fr the .lite ot' the shoe.

To etleet the object of in v invention as it relates to improved means for securing' the detachable and removable wearing sections thereoi to the hack sections the invention consists ot the various :tentures and details ot construction hereinafter described and claimed. i

To effect the object ot the invention asv it relates to providing' a shoe, the wearing' snrtaee of which comprises relatively hard and sottl portions, my improved hrake shoe consists oi a snitahle body portion o't usual shape .termed in the tace o1' wearing' sui'- 'tface ot which ar i transverse recesses or open* ings which terminate at short distances, say one-quarter ot an inch troni opposite sides ot the hrake shoe, said brake shoe being termed from white cast iron and heini;I only partly annealed, so as to convert the outer portions of said hrake shoe into sott., malleable ironn leaving;` the inner portions praeticallv linclianggel and very hard said inalleahle iron and white rast iron merging' into each other gradually, thus preventingr the formation oit sharp cutting' edfies in the faces of the shoes.

In the aceoinpanving drawings, in which hij; invention is tally illus' .tem-Figure l is a hack view ot' a brake shoe embodying my invention, sl'rowingf; the hack section and 'wearing section thereof oniy partially ong'aged with each other, the attachingl ing' being shown in pian section to expoee the means t'or securing' the hack and wearnig sections ot the. shoe together; liig if) is a central sectional, Aview ot' niv improved hrake shoe` the hack and wearing seeti ons thcreot heilig in t'iill engagement with each other; Fie'. 3 is a it agineiitary swtional plan view ot' a modified constrm'ztion, snl'istantially similar to that portion ot Fie'. l which is shown in plan section; and ltig. et is a transverse sectional view o-n the line that of Fig. 3.

leierringl now to liigi's. lA and Q ot' the drawings, A designati-M5" as a ,vhole7 n hrake shoe embodying niy inventiong said shoe comprising' a wearing section A and a hack section fi. said hack section It? being proi vided with a usual attaehiiiol hip; o and guide lugs of, h v means o't' which it is adapted to be secured in the brake head (not shown).

ln accordance, with my invention, the, wearingl section di' is adapted to he eonnerted to the hack section if in the i'followiney manner: Formed on the hack ort the vii-nr'- ing sec-tion xi is a stud l, itornied on which are lugs or projectioiis Q, The stud l is adapted to he inserted thronfgh a holo or openinp 3 which is toi-ined through the renter ot the hack section il?? said opening` f being provided with .slots or lateral exteny sions 4t adapted to permitthe passage therethrough ot the legge oi' projections on said stud l, the relation heine; such that when. the sind l and lugs or projectionel 2 thereon are inserted through the hole 25? and the lateral extensions il thereof, said lugs or projections 2 on said stud may he interlockei'l with the .ledges termed h v the upper ser taees of the parts 5 ot the hack section A intermediate the slots #t hy turning' the wearing' section A and the beek section A? rela tivelj,Y to each other to brine; said wearing' and hack sections in line with each other. A'

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and slots -lare preferably so arranged that to insert the lugs 2 through the slots or openings et, it will be necessary to turn the wearing section it and back section )if sulistantially at right angles to each other.

ln order that the stud 'l and lugs or projections thereon may ist obstruct the opening (3 in the attachinglug o, said stud l is made ot such length that when said stud and the luos or projections thereon are in full engagement with the back l, the end of said stud will not project into said key opening, and a recess being' izorined in the side ot said key opening substmitiallfy equal in depth to the thickness oi' the lugs 2 on the stud l. Aliso, in order that the lng-s Q may not interfere With turning of said secf tions ik, ,3E relatively to each other, the sides ot' the key opening are cnt away substantially concentric vfith the axis ot the l to forni openings oit suitable size to 'the lugs llOl@ o receive said lugs or lateral projections Q, as shcivn at 8, Fig. l.

ln order tol lock the ends ot the Wearing sections A to the back section AE, dovetailed tongues are formed on the ends of said Wearing sections A2 which are adapted to. engage corresponding dovetailed grooves 10 termed in the inner suriace oi' the back section A? adjacent to its ends, both said dovetailed tongues and grooves being arranged concentric With the axis ot' the stud l on said Wearing section 2 and or" the hole 3 in the back section A2, the relation being such that when the stud l is inserted through the hole 3 and the sections ci? the shoe are turned into line With each other, said tmigues t) will enter said grooves 10.

Pivotal movement' of the sections of the shoe it relatively to each other in the dir-e tion to effect engagement of the tongues 9 with the grooves l() is adapted to be limited by means ot suitable stops, formed, as shown, by closing the ends of said grooves opposite to the entrance ends thereof', as shown at l1, the relation being such that when the inner ends oithe tongues 9 strike the closed ends l1 oit' the grooves l0, the sections and A2 ot said shoe. will be in line with each other. Preferably, also, means are provided for preventing accidental turning or" the sections or said shoe relatively to each other after they have been connected. its shown, said means consist of ribs 12 formed on the under sides ci? the lugs 2, which are adaiiited to engage grooves 13 formed on the ledges 5 on the back section A2 when the sections of said shoe are turned into full designed engagement With e: ch other.

As a inodiiication ot the construction shown in 1 and 2, l contemplate inaking the lugs on the attaching stud on the Wearing section of the slice in the :torni of a head which provided with a liolc or opening, which, when the sections of the shoe are iii full designed engagement With each other, will register with the key opening in the attaching lug termed on the back section of the shoe. With this construction, it is obvious that, when t-he shoe is inserted through the key opening in the attaching lug, it will also pass through the hole in the head on said attaching stud, thereby securing the vvearing section of the shoe to the brake head independently of the back section of the shoe, and also etfectually locking the sections of said shoe against pivotal movement relatively to each other. This modification is shown in Figs. 3 and 4f et drawings, referring to which A3 designates the n aring section of the shoe, A* the back section thereof, of the attaching lug Ytorined on said back section, l' the stud on the .vearing section A3, 3 the hole or openingl in the back adapted to receive said stud, Q the lugs on said stud l adapted to engage ivith the lledges 5 on said back section At, and a the slots in the sides ot the central hole or opening 3 adapted to permit the passage of the lugs 2. in said modified construction, the lugs 2 are formed by the shoulders at the under side of a head 14 on the stud l', which is substantially the same in shape in horizontal section as the lugs 2. Formed through said head le is an opening 15 which is ot the same size and shape as the key opening 6 in the attaching lug a?, and which is adapted to register with said key opening When the. sections ot said shoe are turned into full designed engagement with each other. In order to make the open- Y ing 15 through the head let of desired size, the dimensions of said head are necessarily made larger than the corresponding dimensions ot said hole or opening, the sides, top and bot-tom of the key opening 6 in the attaching lug being recessed to receive said headv it and to provide for desired pivotal movement thereof, as indicated at 16,

Again referring particularly to Figs. l and Q ot' the drawings, the Wearing portion ot the shoe A, specifically the Wearing section A', is made of white cast iron, the outer surface ot which to a depth of about oneeighth ot an inch is converted int-o malleable iron by the usual process of annealing. Said shoes will thus consist ot' an outer shell ot malleable iron, indicated by o3, which will be sott and Will provide the necessary traction or friction to render the braking action ot the shoe effective, and an inner portion ot unconverted White cast iron, indicated at at, which is very hard and will enable the shoe to resist Wear. Also, the malleable and White cast iron portions of the shoe will merge into each other gradually, thus effectually preventing 'the formation of sharp cutting edges in the face of the brake shoe,

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'which would quickly cut and Wear the tires of the car Wheels to which they are applied. In order to increase the malleable area oi the `face of the brake shoe as compared with the White cast iron area, holes i7 are formed transversely in the i'ace of the shoe, the number of said holes being increased or decreased as it is desired to increase or de crease the relative areas of malleable and oil white cast iron. Preferably, also, said holes 17 extend to Within a short distance, say one Quarter of an inch of the side of the brake shoe. .lit these points, the lateral wall of the brake shoe will be convertecfl into n'iallea-ble iron entirely through, thus rendering it strong and tough and greatly reducing the chances oit its breaking in use.

l claim l. As a newv article of manufacture, a brake shoe crm'iprising, separate back and Wearing sections and means for detachably connecting said sections, said means con'iprisinsl a stud on said Wearing section, projections thereon, a hole t'ori'ned in said back section to receive said stud and, 'the jn'ojections thereon, ledges Within said hole :ulapted for engagement by the projections on said stud, and interlocking parts on said back and wearing sections constructed and arranged 'tor engagement and disengagement by turning said baci; and Wearing seclions relatively to each other, substantially as described.

iis a new article oi manufactnre, a brel-e shoe con'iprising separate back and wearings sections and means for detachably connecting' said sections, said means comprising a stud on said wearing section, projections thereon, a hole formed in said back section to receive said stud and the projections thereon, ledges Within said hole :ulapted for engagen'ient by the projections on said sind, and interlocking tongues and grooves on said sections constructed and arranged tor engagement and disengagement by turning said sections relatively to each other, substantially as described.

3. is a new article et manufacture, a brake shoe comprising separate back and wearing sections and means tor detachably connecting said sections, said means comprising a stud on said wearing section, a head thereon provided with shoulders at its under side, a, hole formed in said back section adapted to receive said stud and. the

head thereon, ledges within said hole ada-pted for engagement by the shoulders on said head, and .interlocking` parts at the ends ol said bac-k and Wearing sections constructed and arranged ior engagement and disengagement by turningl said back and Wearing sections relatively to cach other, said head being provided with a key opening Which is adapted to register with the key opening,T of the shoe when said sections are turned into line with each other, silbstantially as described.

el. As a new article of manufacture, a brake shoe comprising' separate back and Wearing` sections and means for detachably connectingY said sections, said means comprising a stud on. sai/l Wearin` sections, jinojeotions thereon, a. hole :formed in said hack section adapted to recei ve said stud and the projections thereon, ledges Within said hole adapted 'l'or engaageinent by the projections on said stud, interiticking,l parts on said back and Wearing` sections constructed and arranged for engagement and disengageinent by turning said back and Weariim sections relatively to each other, and stops adapted for definingtull engagement of said in te rlockin g parts, substantially as described.

5. As a new article of manufacture, a brake shoe comprising' separate back and wearing sections and means tor detach ably connecte;ngl said sections, said means comprising' a stud on said wearing sections, projections thereon, a hole formed in said back sect-ion adapted to receive said stud and the project-ions thereon, ledges Within said hole adapted for engagement by the projections on said. stud, and interlocking ngnes and grooves en said back and Wearing scc-tions constructed and arranged for engagement and disengagement by turning,I said backA and wearingl sect-ions relatively to each other, correspondino' ends ot said grooves beingl closed to torni stops Which deline i'nll engagement ol said interlocking tongues and wroores with each other, substanti ally as described.

ln testimony that l claim the l'foregoing as .my invention, l ali-ix my signature in pres ence of two slibscriloingl Witnesses this th day of Decenlher, A, D., 11919.

lll. V. Biron..

Copies of this patent may be obtained for five cents each, by addressing the Commissioner et Patents, Washington, D. C. 

